kxs-sp/Areas/Admin/Controllers/BaseController.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using MySystem.Models;
using Library;

namespace MySystem.Areas.Admin.Controllers
{
    public class BaseController : Controller
    {
        public WebCMSEntities db = new WebCMSEntities();
        public string Host = Library.ConfigurationManager.AppSettings["Host"].ToString();

        public BaseController(IHttpContextAccessor accessor, ILogger<BaseController> logger, IOptions<Setting> setting)
        {
        }

        #region 两点距离

        public double GetDistanceNumber(string start, string end)
        {
            if (!string.IsNullOrEmpty(start) && !string.IsNullOrEmpty(end))
            {
                string[] startpos = start.Split(',');
                string[] endpos = end.Split(',');
                double lng1 = double.Parse(startpos[0]);
                double lat1 = double.Parse(startpos[1]);
                double lng2 = double.Parse(endpos[0]);
                double lat2 = double.Parse(endpos[1]);
                double radLat1 = rad(lat1);
                double radLat2 = rad(lat2);
                double a = radLat1 - radLat2;
                double b = rad(lng1) - rad(lng2);
                double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));
                s = s * EARTH_RADIUS;
                s = Math.Round(s * 10000) / 10000;
                return s;
            }
            return 10000000;
        }
        private double rad(double d)
        {
            return d * Math.PI / 180.0;
        }
        private double EARTH_RADIUS = 6378.137;

        #endregion
        
    }
}